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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3dbe0e4ccee3d19db1606276f42a4d278404e98a9a1d5d07ad8090537b5b091' 
  AND token = 'sGxR+567Sr0sRvmzTecppiPiCMOGPl9fADY8awEjgYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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