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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacb67266f30acd1e9d5ed7f62908347cc751971ec3780c2496972f5fa60b869' 
  AND token = '9OAdql6oUXvEodkHvivrRgna8uM68Lmnmzm92w7poDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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