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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ea0d4f17a442c90bbff0e5b39a13ff8f95c9ba77677d06d849895cbe847e53' 
  AND token = '2cmUd4Pj6GBHKTzndiu/tGshN5keGgLINu3KEIWP8+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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