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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d10adcb3a263a08645e1e05e1a9382fc0626c19aaef872f6e3e355ba0c62ba3' 
  AND token = '4Zbgi/BEmiw9BmVMbbs7/3dA6X/92oZacvxHG/Qqg/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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