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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905431c836ff1d9b0d58276e9f9e57db4475218f6476ca28315d26804b1ae420' 
  AND token = 'mB6Q8LE/xOi8F0zeSy/BwBbdILfp8Zxrvaq1DmSsvHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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