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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c6362ce97ca4920fc738faeda90bdaf4892a971c29c04cc13537cf6395847e' 
  AND token = '7hr32Dc5MRaad5Xp1yUJ18fDEzQxdalA2ZlfdB6Oar8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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