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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1c9f451168f12b4abd133b91f7df8bf0719971376834f73c4f491e6c80e6d0' 
  AND token = 'kx92rpNgSCoDVjv67eUT4R/+a9J36I/XINqOhRl2IJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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