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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee9b6b8530270a4046795f30d01fcc48ee73d79c7d01ffa90e6eca7a077c13b' 
  AND token = '/rO0c5MZzYnHSgb8qoq4BUEuuDn8JXEbP2U2BZvCe8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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