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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc522235ec118ab3e50b10b81642281eec721212e47124590bdc0293042e82f4' 
  AND token = 'yPV3GLNTAi7v4r1jLBSd3PJswOmmb1W026tvbAL24nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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