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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c8ea37ca41d2907d4bba5517ee7c84929e97ac373d271e8c7cff3f617cf426' 
  AND token = 'TKqJjuAZx1T5dGnVAadL9iewbyeknAlkxEB2bIfcp04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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