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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b5804d719062d5f8ce76eca83df024a757fc1f5b389b4456aac380269e9a2d5' 
  AND token = 'Ynp4Snl8mueCy9dhz9LxT4LkqxMBAAU0bYry4uQ/otg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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