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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70117165f87442283dc8e4dcf5e521b60e82e8ffab7f0d3218d70f599ad013c' 
  AND token = 'lbfhB02762K/j7snTdyD0RuPPZ2O/uH7Bzv/E4oMjdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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