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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d77792c582328d2d5100db1ee2ea002514a6be07cd9f2d264bf586851c321bb' 
  AND token = 'sEqrtygC2CI5IUO7kGPGaJD9a9c0shArUskpVfQIdeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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