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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43c7583b2aeb37564950f92c3eff5ab9d052246e1fe70824ad39f2998a9867d' 
  AND token = '6N05hF4uQrCfUYQizu/bHF+Yh2BwUVNy4dtpNBDD9ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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