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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86c5e5673346f742ea70edb48653ed4c704b76ef1790507123199590e187937' 
  AND token = 'MvJ5QQVM5wO+ztrcEbjICxEL9do3zDGKcXA1NFBMx1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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