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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fe341deeac97e41813e963ede5fcf634a43e9c2304ba92569fbafe41261e22' 
  AND token = 'ONrX0KVqv8nbAJMM6ji8ntQ/8tcqLv2H0XND6NrDvYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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