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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5245dff8a2ee9172a7b769cc4646a55a157a5be3e2c3d8bd78e7bd98a13971' 
  AND token = 'dGYd9wqljditJS6O7zFK9Lx13dKW7RNM/Y1gg+1xKJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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