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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb29642dfe67f2b929a75e76ca8f1bcbc3b2dd488c591f0116a6569dbc86264' 
  AND token = '0GeVXbg3jl9ZaTnn9LQVDlc+Z+KBkhPahgW4yuQi59s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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