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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6e07a649447c4334daeeea78401a50e2ac3397407010dbbbbd48f51c0ec1ff' 
  AND token = '3gsORJP6ECtBgHQSiqSNj3fRKOSXgcZ0xD29dxnll3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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