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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cb4acc7cacb0faf56e69e8cb0f6c282823c487953004a6334795aefd4b9542' 
  AND token = 'YjPFH8NDJRjMfz951WjU7Q+A7899zcfhNuYBUv4xmPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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