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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45e52300f45e4f0a145d4962052c9779b71ed9596a4cdc2d3321bb0771daa21' 
  AND token = 'jfktDt+/XhnubjZsQFIL/Iby0KIa+8ye2+CbXHumfv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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