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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba62de4e2b252a62d20d6ab7b34344035f02390badf618194988d44e9f11275' 
  AND token = 'K6Bp/7HS87nfSUNIU61aL77+/1a6/hfdPJDoCoQmG64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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