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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0b0db57727b1e1a5e53457dab236f4ee8783e09c101aecc6a6e69a82a93e93' 
  AND token = 'yZzgg48wbkCXFJWLe2lRzRPW6sALL34OM3CqBLmF+j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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