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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceac03ab0013704c4eac2982fd96e835bb8910872a75b2fb4db0b8d025fa82ba' 
  AND token = '3D4kJmY3nTW4rDT+05XqYd6YuEFo3ypHwqzEmtS3HhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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