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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5674b7c697f3101b4b1050ef596c6a9fdcd2936bab3f414eac70ff176012ceb7' 
  AND token = 'Fla/D4Uct07u7HVx/OxQrhGp89vhAQT3PD1Ol86yqQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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