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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71830ee4113817e4450ce60760bd7dd9535269c5759a4d6f9a3d476547b36ae6' 
  AND token = 'CXOCe7p8LFXbua1e2WehgKTxrZB0X7iVh3aKJkqzUxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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