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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f3b475cfb9cd4881a508e85d4df8c8fb16839ee18cefcc461ef1836d9d325d' 
  AND token = '+/S5BIb5TPl3pUAQMHvfYUf9odPg/YQAt8BLTyIccR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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