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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827dc696a608b9d28b3708c92cb65a33c3bbd32b86ff17f61c0273f43b2861b6' 
  AND token = 'gCfJjNiDMWx97kvi44SnnCcrDhRNSH4R/bTbFBPVRuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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