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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9913c81a3090d7c842b63158c0368749a5baf0212bfdf9dfb3033994e7285172' 
  AND token = 'fhfrudNNpKiTaFdXSBh+JkdGDNSUNLiTztBmSV3K2vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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