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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96ab2f924a5f043f8abe17e2b9f168c71d63c5c7463c90bdc537f465be69dc6' 
  AND token = 'mu7WKOkpudWvmwsAiSgooJR/EEbMPDwqvI3pXSItfcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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