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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c61d54e6e930e67e79091d8355cdc3e62ed046d46a19bcbd17916b8a7cae4c' 
  AND token = 'XfYPrPNBdzB7LFjkxcc2fUkoU+1n9Pa+tqZRfGmuLds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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