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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86248692d1cf29c4396b252e50cc43fd90982c9b5646c0fdb6f83ae59cddc1e' 
  AND token = '9w0FL2KmdQ495Eqa/FuOILPc63txN+gz3p7cns0tylY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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