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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97aec1f5a87c9e22ff61873ba930986c0d447d5cdcb1259a4ade71a01a33eed' 
  AND token = 'N4R0R3qv6IXjMiU9eaCU4jn77TKeo3dNiiwXDTeVdz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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