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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e7fe1a725e655abfb21403ab134b2d9ecd63dce7f9311dab63368db5c9ecb5' 
  AND token = '7leHBqMvBcrEbwvLVpiIYpyg6Q7edMZzL6swaSccKRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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