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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2aae32c6eaffdbacfa9d3f622ecf89e7f70d2a0be5fcf4407aaab7acd04222' 
  AND token = 'OhpOmiDaEimQDSP0qy9k8T5PhTGranXStmS3JNQkj4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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