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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1babd0b4cb4ac54e8d9c6cd7259d5db4b0f49c31f55cd6624ddc666348ed8ca9' 
  AND token = 'nFI448jWgEKeYuXBg7ZApzekGk5SI4QKgydhDRoQ04M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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