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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba16e31c88bc7001c5f3c8fa6db19f73af7cc0f2a79b6804bab1440339cd40d' 
  AND token = 'zNeJihz4Xa9n83mCLOnNTv1e8DQjX3f8+FuyWjNr8uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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