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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49368dd29a00c1e8280ee601c1acd45388f2961acd2bcd7db6850177744229b7' 
  AND token = 'Iqq0Rjns1hqiUfGFYDpdkKOpT9kGK7fuyMu1kEz94Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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