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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424a1d2264a9af34c278ec3029d1d46a94282e60218a0e50136a577e8b485e5e' 
  AND token = 'qPsymEA6ZjucPjHdS2QQb0KnzvkzO37nLc7V+7cQpmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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