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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f2c857afb9e06ceb3171a28cdffce0a16eff713910e527d3fd00cb63268320' 
  AND token = '/S811fUT6Z8KCYBrRNvKbj8dSR7HowZQjK/xQLhlRfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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