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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbe906b7b66f69c1d843409149ec4c6bd400e250a9fd20661a70af8e6948952' 
  AND token = 'aCEOpVHn4Yx6cI6JoPjurHAPsh3QLcDF+g3odfdKMgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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