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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f65289f101f41bc833a2a11fd8f50bff770e4c8318b952b6a9c86e8291e510' 
  AND token = 'jKV2T2C7wbZjYBE5LJr9+0SlKOhJE06y4ZLbh11J+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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