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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce97c92bda5ef77f9281d21eb876c883abb10fa471e170815b8fbe809ec4ff01' 
  AND token = 'BMym7djowbdtLHu1Q5dZjYzNgcN/Hrwyyp9CboW4um4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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