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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc96793bf040fa27b5b786ad9f85df375ee8882a6b35b48742eca50690f5655e' 
  AND token = 'Fn6YrY6YldiT7Wqq0FYRtkaBii+E14X+DJj7BCKNBZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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