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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defcec05d8261d6a93d38a07efffc2c330af74f8ad9999c5f4f5429352660537' 
  AND token = 'YMBuqcjUjR2Blst5ZoGpCuLZHNT8BMrERLN7mXKkf6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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