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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7b28ea3333c09fb9902dc32eade69ef61e9a320b8da955ea516c923d98f878' 
  AND token = 'MUjGR6vVhkEOVAJ63pAV66Rh3EuY7GUACyflIVK4HvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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