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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35fcb757a1b989dad104b359f7c0e3418615faab33965178523d206f2ae45c5' 
  AND token = 'dXl8J6GpPesqzb6f1GoN7Jq99gPCrU0J1dpkcOqbyZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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