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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe10db044c481dd878997b9d6bce034d05df5c5a7a03e86b0e9a2949f4c3953' 
  AND token = 'cnKDTfoRNQs7KUFK8IESXgqlhorgUBpqbQF22yT5ys4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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