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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0126fb7cdd8a54f1dc38e1ff9663873ff533c061250366ad8a103101a125bbd' 
  AND token = 'RI6ZC8/yrqo454zh4cOIpG59F9cvNRMlTJmn2nsUb34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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