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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc91d9bd62fe7a29b704aef37be0d02c883636bfe4e16a58b8a9ee1e2c7524b' 
  AND token = 'sCfZBe9Cd9bpNrE627dbrM2O3dy9/fa+Wwrfutd0jZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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