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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c25835d011e1d32e648dabd2b59b9a8b3caf87a0daad8e03ad031a5fa36d1e' 
  AND token = 'Q47MBBpQ0MaaWlZm8yuJ0rVlc8q6TQQAx4CEPX90/No=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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