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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79da197db28899580624feb9d19364edcf810c035bb90c53a4d5496ca7b5d173' 
  AND token = 'qwtXASNXvcB4+v0imNe8jGV/+Nd5BClG94Rf8CVrVQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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