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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd7ab42330218d08a187e87d9ab7fb0613efae9df846b4652d3432aa138c6ab' 
  AND token = 'wfdj0MXOtSIs4tals3R2Ian4oCA8v3UD6/QKSQtQ5iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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