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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e08346f5bfad9a97d8eab70770c947b9c1510d3547e88fd6bd478a4ba44b598' 
  AND token = 'e6b9ZNt+i2irOUPrI2pm7U1r3A+GPR/0HSniw64BZig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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