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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7040d87a4ce6e56da90ba5a09307e7b9f68faa86eb23b32e83263908a380bf34' 
  AND token = '/hBwChoDQzKd1EqB48DFuSoOEpY2mi+2danNzfBAlUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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