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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0b88a6090d64b7f5e9fdb6799590bc68bf02db07f5804a5d2627fdeba279e5' 
  AND token = 'My4Jkk0LS3x7xlokc1+QVc2Yd505zlHT43PHRuVBCe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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