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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c0dc1892f44b2720815ca2992d774389d88adfb85cc40ab8f2db96fbcce561' 
  AND token = '93/LsLC30JXa8jyZo2ycOjlkTtmramdjcC4HpCUEfCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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