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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5594999dc88f2e776d4630225512f62ffc77b3bccd94855293b666783ed77d80' 
  AND token = 'XwNN43jfh/bk/maOEnOgTy9nMENKmzakWaOOqmIsgFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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