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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17cab2f31141646b1ea775d613957b7d446c0d4ca9b818a921c13e1e31f7b1c' 
  AND token = 'j3ua2HEqLTVrztM7EmUtG/lApH1xlNRdUaxScOIQh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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