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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a77a9bdc65299704aac453179a373050a6e5dc718498f08632ea1d59ee9c93b' 
  AND token = 'iHnoF2VxgyZA0wgj6VPFmYPuZuYsc6fuo7doPUZyJ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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