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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6040647c96365ff9156718b58911703219160871401cc046f13b7b8243ef1a75' 
  AND token = 'aJ3eEA+B2O6GyFLLkkc2CWQiwWz8Dl8oicvPzawdzqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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