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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ad68b1258f0668da5295fcf92bef4d349527cb52a966fe6f44192c60047e5a' 
  AND token = 'nbQEzh7K6t97epJrkLFVB9loetxP1Sy7Q+lj2XvTEX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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