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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049178fb95dd25acbec73949c573b7c34895b7fb3b0353746535dde730061b61' 
  AND token = '1N0gbUEZEAMBI8l7L/mlZwsImMQwgPMyv803Yia2X4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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