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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af58407103cfb5e4559d2dbd617a856c959a28fd6586528248b493f6663da66' 
  AND token = '3wDflp9Fr8CQo5L9JtW8jeR7ck0En1HD/ty0KxEApUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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