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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4dac30b6d2db2de773cebe4e101672c3d73afdd71a5dd4d4624ff60122bd08' 
  AND token = 'bUFEBIZlBBIBun5YlpIAzL+bU34GS0C4WrD3t5S4b/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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