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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9010601338b7ddbdd40ef8e0387ef7a729afea45966451ffef8a16f8f420e99' 
  AND token = '3RqLEEdGW4FHuoSqAOmONAsw7m0L2CFxez8Pe+Da3SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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