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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bd87f7a118761620c2e0fc8c748581d4113a6a94632b502a80750e6e03ca5e' 
  AND token = 'eqetCdk51KwNuzMNnZJyCfiky8iQwxANPu77yHwAdqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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