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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab26b006dde57a8e00b031e0aba49d8c2ae016deb1f21ecb0275f988397d162e' 
  AND token = 'z4fCN4Y/ZN+O73Mpot0WC+akAFWVLemEsroW1TsqZ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}